The second data set used in our experiments is the National Alliance for Medical Image Computing (NAMIC) Brain Multimodality data set. The NAMIC data set consists of 20 3D MRI images, each composed of 176 slices of \(256 \times 256\)  pixels. As for the CH data set, the resolution of a voxel is \(1 \times 1 \times 1\;mm^3\) . For our experiments, we used T1-weighted (T1w) and T2-weighted (T2w) images independently. Following [1]}, we split the NAMIC data set into a training set containing 10 3D images and a test set containing the other 10 images. We kept the same split for T1w and T2w.
